Mortar and multistage rocket: what they have in common

1. Step 1. Mortar — is part of — Paved road. Roman roads had layers set in mortar.
2. Step 2. Paved road — is made of — Asphalt. Asphalt.
3. Step 3. Asphalt — is made of — Bitumen. A bitumen binder.
4. Step 4. Bitumen — is made of — Crude oil. The residue of oil distillation.
5. Step 5. Crude oil — is material for — Kerosene. A fraction of crude oil.
6. Step 6. Kerosene — is material for — Multistage rocket. The fuel is kerosene.

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